Welcome to Quantas Construction Ltd

Your Trusted Local Builders in Carmarthenshire and West Wales “Building the Future for You” – Est. 2016

Who We Are

At Quantas Construction, we bring over 30 years of combined experience to every project. Based in Carmarthen and West Wales , we are a City & Guilds qualified, time-served team of professional builders, carpenters, plasterers, and renovation specialists. Whether you’re planning a home extension, barn conversion, or need skilled tradespeople for property refurbishments, we deliver high-quality workmanship, on time and on budget.

We work across South Wales and Mid Wales, offering expert building services to both domestic and commercial clients. From listed buildings to new builds, no job is too big or small.

Our Building Services

At Quantas Construction, we offer a comprehensive range of domestic and commercial building services. From skilled carpentry to full property renovations, here’s what we can do for you:

Carpentry & Joinery

Our expert carpenters craft everything from custom-built staircases and storage to bespoke doors, windows, and timber frames. With precision and care, we deliver long-lasting joinery for both modern and traditional properties.

Barn Conversions

Turn disused agricultural buildings into beautiful, functional homes. We specialise in barn conversions that preserve rustic charm while meeting modern building standards, from structural work to final finishes.

House Extensions

Need more space? We build seamless house extensions that add value and functionality to your home — whether it’s a rear kitchen extension, an extra bedroom, or an open-plan living area.

Garage & Basement Conversions

Make the most of unused areas in your property. We convert garages and basements into fully insulated, livable rooms — ideal for home offices, bedrooms, or entertainment spaces.

Building Renovations & Refurbishments

Bring new life to tired properties with full refurbishment and renovation services. From rewiring and plastering to restoring period features, we upgrade homes with minimal disruption.

Property Maintenance & Repairs

We offer reliable property maintenance for homeowners, landlords, and commercial clients — including storm damage repairs, general fixes, and routine upkeep to keep your property in top shape.

Kitchen Fitting

Our skilled kitchen fitters install everything from bespoke cabinetry and worktops to integrated appliances and lighting. With careful planning and expert craftsmanship, we create kitchens that are both functional and beautifully finished—tailored to suit modern homes, traditional layouts, and everything in between.

Bedroom Fitting

Our expert fitters create calm, functional bedrooms with custom wardrobes, storage solutions, and integrated furniture. Whether it’s a master suite or a compact guest room, we deliver tailored installations that maximise space and reflect your personal style.

Solid Plastering & Dry Lining

Our experienced plasterers provide smooth, durable finishes for walls and ceilings, including solid plastering, dry lining, and patch repairs — perfect for both old and new builds.

Stone Walls

Protect and restore your stone or brick walls with our specialist pointing and repointing service. We use traditional techniques that maintain structural integrity and enhance curb appeal.

Log Cabins & Pods

We are experts in designing and building log cabins from scratch using the latest technology and building methods

New Builds & Self-Build Homes

Start from the ground up with our new build services. We manage the process from foundations to finishes, working closely with you or your architect to bring your dream home to life.

Listed Building Work

We’re experienced in working on listed and heritage properties, using traditional materials and methods to meet conservation standards while improving function and comfort.

Commercial Work & Shopfitting

From office refurbishments to retail shopfitting, we deliver quality commercial building services that minimise downtime and reflect your brand’s image.

Bathroom Fitting

From full refurbishments to sleek upgrades, our bathroom specialists install everything from baths and showers to tiling and lighting. With careful coordination and high-quality finishes, we create bathrooms that are both practical and beautifully designed.

Bespoke Services

We offer tailored construction solutions for unique spaces and creative builds, from custom joinery to garden studios and feature walls. Working closely with you, we bring one-of-a-kind ideas to life with precision, craftsmanship, and attention to detail.

Our Recent Projects

Take a look at our recent work — from stunning barn conversions to intricate sash window restorations, our gallery shows the quality and care we bring to every project.

Reviews From Our Clients

Why Choose Quantas Construction?

30+ Years of Combined Experience
City & Guilds Qualified, Time-Served Tradesmen
Attention to Detail – Clean, Professional, Precise
Excellent Timekeeping & Communication
Free, No-Obligation Quotations
Trusted by Lord Portman’s Estate – Marble Arch, London
Award-Winning Project: Ty Menyn Holiday Cottage, Llandeilo

We believe our reputation is only as good as our last job. That’s why we treat every project — big or small — with the same level of care and commitment to excellence. Our goal is simple: 100% customer satisfaction.